In Situ Remediation of Inorganic Contaminants Using Stabilized Zero-Valent Iron Nanoparticles

a zero-valent iron nanoparticle, in situ technology, applied in water treatment compounds, water/sludge/sewage treatment, chemical instruments and processes, etc., can solve the problems of contamination legacy, inability to use in situ applications, rapid loss of soil mobility and reactivity, etc., and achieve low cost
US20070256985A1Inactive Publication Date: 2007-11-08AUBURN UNIV
10 Cites 69 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
AUBURN UNIV
Publication Date
2007-11-08
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A method for preparing highly stabilized and dispersible zero valent iron nanoparticles and using the nanoparticles as a remediation technology against inorganic chemical toxins in contaminated sites. The method employs a composition containing select polysaccharides (starch or cellulose) as a stabilizer for the iron nanoparticles in a liquid carrier, and results in suspensions of iron nanoparticles of desired size and mobility in water, brine, soils or sediments. The stabilizer facilitates controlling the dispersibility of the iron nanoparticles in the liquid carrier. An effective amount of the composition is delivered to a contaminated site so that the zero valent iron nanoparticles can remediate one or more toxins such as an arsenate, a nitrate, a chromate, or a perchlorate in the contaminated site.
Need to check novelty before this filing date? Find Prior Art

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from U.S. Provisional Patent Application Nos. 60 / 787,626, filed Mar. 30, 2006 and 60 / 872,616, filed Dec. 1, 2006.BACKGROUND OF THE INVENTION

[0002] The present invention relates to mitigating the toxic effect of inorganic contaminants in contaminated sites, and more particularly, to using stabilized zero-valent iron nanoparticles for the in situ immobilization and / or remediation of toxic inorganic contaminants such as chromate (CrO42−), perchlorate (ClO4−), nitrate (NO3−), and arsenate (AsO43−) in water, brine, and soil.

[0003] Chromium has been widely detected in groundwater and soils, particularly at sites associated with metal plating, wood processing, leather tanning, metal corrosion inhibition, and pigment production. From 1987 to 1993, releases of various chromium compounds to land and water in the U.S. totaled nearly 200 million pounds (EPA, 2006). Compared to the much less soluble Cr(III) species...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More